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Linux offers many ways to get help. Let s start with a short overview: The man command offers documentation for most commands that are available on your system. Almost all commands accept the -help argument. Using it will display a short overview of available options that can be used with the command. For Bash internal commands, you can use the help command. This command can be used with the name of the Bash internal command that you want to know more about. For example, use help for to get more information about the Bash internal command for.

The part on the right of the vertical bar (|) is the description of the retrieved rows. The expression in Listing 2-3 can be interpreted as saying I want a set of rows that come from the Member table, and each row must have M as the value for the Gender attribute. The letter m in Listing 2-3 is officially called a tuple variable, but I ll refer to it as a row variable (which is not strictly accurate but a bit easier to understand). I like to think of the variable acting like a finger, as in Figure 2-3. The finger (labeled m) points to each row in the Member table and checks to see whether it obeys the condition that its Gender attribute has the value M . As our queries get more complex, we will have many different fingers pointing at different tables.

Using a virtualized computer is a great way to try out Ubuntu before you commit yourself to anything more drastic, but you have to be aware of the drawbacks as well Operating systems running within virtual computers tend to operate more slowly compared to running natively on a computer, and the virtualized hardware is often very simple (virtual machines have only recently gained the ability to access your computer s 3D graphics hardware, for example) Setting up a virtual computer can be difficult for those who are new to it, and you ll require a powerful PC with at least 2GB of memory (and more like 3 4GB for optimum results) One final note: virtualization software is also available for Ubuntu, which means you could install and run Windows within a virtual machine running on Ubuntu.

This is an excellent way to go if you still need access to a few legacy Windows programs QEMU, mentioned previously, runs on Ubuntu, as does VirtualBox and the various VMware products..

Note An internal command is a command that is a part of the shell and does not exist as a program file

Note In Windows, you can use Windows Explorer to launch program executables by just browsing to their

Listing 2-4. The SQL Statement to Retrieve All the Men from the Member Table SELECT * FROM Member WHERE Gender = 'M'

locations within Program Files and double-clicking their .exe files. It s technically possible to run programs by using Nautilus to browse to their locations, but this is discouraged. One reason is that Ubuntu doesn t store all of its programs in one central folder, as Windows does. However, most programs that are used on a daily basis can be found in /usr/bin. If the program itself isn t stored in /usr/bin, the folder will contain a symbolic link (effectively, a shortcut) to the program s genuine location on the hard disk, which means it s usually possible to launch an application either by typing its name into the terminal or by pressing Alt+F2 and typing the name.

on disk. To get an overview of all available internal commands, just type help on the command line.